EDP Sciences logo
Subscriber Authentication Point
Search
Menu
Home All issues Volume 614 (June 2018) A&A, 614 (2018) A82 Full HTML
Open Access

Table 3

Joint S/N threshold qJ for different values of mean Poisson noise λ (expressed in counts/pixel), different values of mean Gaussian noise σ217 (in Δ T∕T units), and several filter sizes (in arcmin).

θs = 0.8 λ = 0.03 λ = 0.06 λ = 0.09 λ = 0.15 λ = 0.25 λ = 0.40 λ = 0.70 λ = 2.00 λ = 7.50
σ217 = 10−5 7.31 5.67 5.09 4.71 4.59 4.52 4.50 4.51 4.51
σ217 = 2 × 10−5 8.84 7.02 6.21 5.45 4.94 4.70 4.55 4.50 4.52
σ217 = 2.5 × 10−5 9.15 7.40 6.57 5.77 5.17 4.84 4.61 4.53 4.53
σ217 = 3 × 10−5 9.34 7.64 6.84 6.03 5.38 4.98 4.69 4.54 4.55
σ217 = 4 × 10−5 9.55 7.95 7.17 6.38 5.69 5.23 4.86 4.60 4.56
σ217 = 5 × 10−5 9.65 8.10 7.36 6.59 5.93 5.44 5.01 4.65 4.57
σ217 = 6 × 10−5 9.71 8.20 7.47 6.72 6.08 5.58 5.15 4.70 4.59
θs = 5.19 λ = 0.03 λ = 0.06 λ = 0.09 λ = 0.15 λ = 0.25 λ = 0.40 λ = 0.70 λ = 2.00 λ = 7.50
σ217 = 10−5 6.19 5.14 4.79 4.60 4.52 4.43 4.42 4.42 4.42
σ217 = 2 × 10−5 7.06 5.96 5.50 5.07 4.76 4.55 4.44 4.41 4.38
σ217 = 2.5 × 10−5 7.23 6.17 5.72 5.25 4.92 4.65 4.52 4.44 4.41
σ217 = 3 × 10−5 7.34 6.32 5.87 5.40 5.05 4.76 4.58 4.48 4.43
σ217 = 4 × 10−5 7.47 6.49 6.06 5.59 5.23 4.92 4.71 4.53 4.46
σ217 = 5 × 10−5 7.52 6.58 6.17 5.70 5.35 5.04 4.81 4.58 4.49
σ217 = 6 × 10−5 7.56 6.64 6.23 5.76 5.43 5.14 4.90 4.63 4.51
θs = 30.0 λ = 0.03 λ = 0.06 λ = 0.09 λ = 0.15 λ = 0.25 λ = 0.40 λ = 0.70 λ = 2.00 λ = 7.50
σ217 = 10−5 5.11 4.54 4.40 4.18 4.21 4.17 4.01 4.10 4.10
σ217 = 2 × 10−5 5.51 4.97 4.67 4.43 4.50 4.39 4.23 4.28 4.22
σ217 = 2.5 × 10−5 5.59 5.06 4.74 4.52 4.60 4.44 4.29 4.36 4.26
σ217 = 3 × 10−5 5.63 5.11 4.80 4.58 4.64 4.48 4.34 4.43 4.28
σ217 = 4 × 10−5 5.66 5.16 4.88 4.65 4.69 4.51 4.40 4.51 4.28
σ217 = 5 × 10−5 5.68 5.17 4.91 4.69 4.70 4.52 4.45 4.56 4.28
σ217 = 6 × 10−5 5.69 5.18 4.94 4.71 4.70 4.54 4.49 4.58 4.26

Notes. These thresholds correspond to a false alarm rate of 3.4 × 10−6 (equivalent to a 4.5σ cut in a Gaussian distribution). They correspond to the case where exposure time is 400 s and NH = 2 × 1020 cm−2.

Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.

Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.

Initial download of the metrics may take a while.